I had a series of lights come on all at once and did some research and found out the 12V battery was going bad so I replaced it. Lights went out upon restart, great! Thought the problem was solved and about a week later the same thing happened again. I have since learned that if I disconnect the battery, then reconnect both terminals the car runs fine for about a week. So I didn’t really need a 12V battery as first thought? What is the real problem?